Method for preparing amine-terminated polyether by leaving group method

Abstract

The invention relates to a method for for preparing amine-terminated polyether by a leaving group method, including esterification reaction and amination reaction. The method comprises the following steps of: dropping the mixed solution of polyols and a catalyst into the mixed solution of chloro-carbonic ester and solvent, ventilating nitrogen, controlling the temperature of a reaction system not bigger than 20 degrees centigrade, heating the reaction liquid to 20-150 degrees centigrade after dropping, carrying out vacuum filtration after adequate reaction to obtain the solvent-containing carbonate seal end polyether; adding the solvent-containing carbonate seal end polyether into polyamine, stirring the same for 10-120 minutes under normal temperature and pressure, removing excess polyamine, solvent and by-product of mother solution by a molecular still at distillation temperature of 110-170 degrees centigrade and under pressure of 1*10<-2>Pa-200Pa, thereby obtaining the mine-terminated polyether containing carbamate group. The method for preparing amine-terminated polyether by the leaving group method disclosed by the invention has the advantages of mild reaction conditions, low operation cost, no high temperature and pressure and few by-product during the whole process, and is simple in process and by-product is easy remove.

Description

technical field [0001] The invention relates to a preparation method of amino-terminated polyether, specifically, a method for preparing amino-terminated polyether by a leaving group method. Background technique [0002] Amino-terminated polyether is a kind of compound whose main chain contains a polyoxyalkylene structure, and the end of the molecule is capped by a primary or secondary amino group. It is usually obtained by chemically treating the terminal hydroxyl group with the corresponding polyether polyol, also known as polyether amine, polyether polyamine. [0003] Compared with polyether polyols, the reactivity of amino-terminated polyethers and isocyanates has increased by about 3 orders of magnitude, so that the preparation of polyurethane (polyurea) materials can be rapidly molded even without heating and catalyst-free conditions, improving the Production efficiency of polyurethane (polyurea) products. [0004] At the same time, because the polarity of the urea ...

AI Technical Summary

Problems solved by technology

However, the above-mentioned synthesis techniques for preparing amino-terminated polyethers by the above-mentioned leaving group method have disadvantages such as difficult purchase of raw materials, environmental pollution, and many reaction by-products.

In particular, the post-treatment of the aminated product requires the use of a large amount of alkali to neutralize the acid generated by the reaction, resulting in a large amount of inorganic salts. Due to the compatibility between the amino-terminated polyether and the inorganic salts, it is difficult to separate the product